全文获取类型
收费全文 | 430046篇 |
免费 | 30230篇 |
国内免费 | 6571篇 |
专业分类
耳鼻咽喉 | 5792篇 |
儿科学 | 8782篇 |
妇产科学 | 10514篇 |
基础医学 | 57838篇 |
口腔科学 | 12581篇 |
临床医学 | 36447篇 |
内科学 | 84069篇 |
皮肤病学 | 9002篇 |
神经病学 | 29620篇 |
特种医学 | 16027篇 |
外国民族医学 | 106篇 |
外科学 | 66469篇 |
综合类 | 22018篇 |
现状与发展 | 16篇 |
一般理论 | 67篇 |
预防医学 | 21770篇 |
眼科学 | 10572篇 |
药学 | 36703篇 |
56篇 | |
中国医学 | 5668篇 |
肿瘤学 | 32730篇 |
出版年
2022年 | 2795篇 |
2021年 | 5243篇 |
2020年 | 3661篇 |
2019年 | 4182篇 |
2018年 | 6209篇 |
2017年 | 5191篇 |
2016年 | 5084篇 |
2015年 | 6582篇 |
2014年 | 8918篇 |
2013年 | 10621篇 |
2012年 | 14722篇 |
2011年 | 15356篇 |
2010年 | 10002篇 |
2009年 | 9021篇 |
2008年 | 12998篇 |
2007年 | 13688篇 |
2006年 | 13262篇 |
2005年 | 11967篇 |
2004年 | 10530篇 |
2003年 | 9947篇 |
2002年 | 9287篇 |
2001年 | 29127篇 |
2000年 | 29506篇 |
1999年 | 24245篇 |
1998年 | 5518篇 |
1997年 | 4587篇 |
1996年 | 4073篇 |
1995年 | 3728篇 |
1994年 | 3257篇 |
1993年 | 2972篇 |
1992年 | 16167篇 |
1991年 | 14923篇 |
1990年 | 14250篇 |
1989年 | 14015篇 |
1988年 | 12651篇 |
1987年 | 12118篇 |
1986年 | 11151篇 |
1985年 | 10357篇 |
1984年 | 6941篇 |
1983年 | 5607篇 |
1982年 | 2728篇 |
1979年 | 5486篇 |
1978年 | 3355篇 |
1977年 | 2973篇 |
1975年 | 2642篇 |
1974年 | 3074篇 |
1973年 | 2864篇 |
1972年 | 2834篇 |
1971年 | 2776篇 |
1969年 | 2546篇 |
排序方式: 共有10000条查询结果,搜索用时 180 毫秒
81.
82.
Umar Nadia K. Badshah Maaz B. Sandrasegaran Kumar Ghabril Marwan Agarwal Saurabh Tann Mark Lacerda Marco Kwo Paul Y. 《Digestive diseases and sciences》2015,60(7):2196-2200
Digestive Diseases and Sciences - To determine whether the presence of portal vein thrombosis (PVT) where venous flow within the liver may be altered may delay the diagnosis of HCC and be... 相似文献
83.
84.
Irmak Karaca Suzan Güven Yılmaz Melis Palamar Halil Ateş 《Ocular immunology and inflammation》2020,28(6):947-951
ABSTRACT
Purpose
To investigate the effect of 1% tropicamide on anterior chamber aqueous flare (ACAF) measurements acquired with laser flare meter in patients with pseudoexfoliation. 相似文献85.
目的 阻塞性睡眠呼吸暂停低通气综合征(OSAHS)是耳鼻咽喉科的一种常见病,儿童发病率呈上升趋势,调查显示儿童OSAHS发生率为4%~5%,2~6岁是发病的高峰期。OSAHS不仅严重影响儿童的睡眠质量,还会引起儿童生长发育迟缓、智力缺陷等一系列不良反应,OSAHS患儿的主要病因是扁桃体和/或腺样体肥大,因此最有效的治疗方法是扁桃体切除术和腺样体切除术。而扁桃体和腺样体是儿童淋巴组织系统的重要组成部分,在机体的防御和保护功能中发挥着重要作用。手术治疗OSAHS是否影响儿童的免疫功能目前存在争议。一些学者认为扁桃体切除和腺样体切除后儿童的免疫力降低,而另一些学者认为OSAHS儿童的免疫力在手术后保持不变,甚至比手术前有所提高。本文就儿童OSAHS手术前后免疫指标的变化作一综述。 相似文献
86.
87.
Toneva Diana H. Nikolova Silviya Y. Tasheva-Terzieva Elena D. Zlatareva Dora K. Lazarov Nikolai E. 《International journal of legal medicine》2022,136(6):1851-1863
International Journal of Legal Medicine - Sex identification is a primary step in forensic analysis of skeletal remains. The accuracy of sex estimation methods greatly depends on the sexual... 相似文献
88.
James I. Geller MD Joseph G. Pressey MD Malcolm A. Smith MD Rachel A. Kudgus PhD Mariana Cajaiba MD Joel M. Reid PhD David Hall PhD Donald A. Barkauskas PhD Stephen D. Voss MD Steve Y. Cho MD Stacey L. Berg MD Jeffrey S. Dome MD PhD Elizabeth Fox MD Brenda J. Weigel MD 《Cancer》2020,126(24):5303-5310
89.
Background:Colon cancer is a common malignant tumor of the gastrointestinal tract. Therefore, a clear diagnosis is particularly important for the treatment of colon cancer. Ultrasound and spiral computed tomography (CT) can both be used in the diagnosis, but each has its own advantages and disadvantages, which could cause confusion in clinical choice. The purpose of this study was to systematically evaluate the practicability of spiral CT and ultrasound in the diagnosis of colon cancer.Methods:A systematic search was performed by retrieving on English databases (PubMed, Embase, Web of Science, the Cochrane Library) and Chinese databases (CNKI, Wanfang, Weipu [VIP], CBM). Besides, manually search for Google and Baidu academic of diagnostic experimental study of ultrasound and spiral CT in the diagnosis of Colon Cancer. The retrieval time limit was from the establishment of the database to October 2020. Two researchers independently extracted and evaluated the quality of the data in the included study. A meta-analysis was performed using Meta Disc1.4 and RevMan5.3 software.Results:Sensitivity, specificity, positive Likelihood ratio, negative likelihood ratio, and diagnostic odds ratio were used to determine the diagnostic efficacy of ultrasonography and helical CT in colorectal cancer.Conclusions:This study will compare the practicability of CT and ultrasound in the diagnosis of colon cancer and provide reliable evidence-based basis for clinicians to choose the appropriate or best evidence-based basis.Ethics and dissemination:The private information from individuals will not be published. This systematic review also will not involve endangering participant rights. Ethical approval is not required. The results may be published in a peer-reviewed journal or disseminated in relevant conferences.OSF Registration number:DOI 10.17605/OSF.IO/WAJHQ 相似文献
90.
Yi Su Suey S.Y. Yeung Yu-Ming Chen Jason C.S. Leung Timothy C.Y. Kwok 《Journal of bone and mineral research》2022,37(6):1179-1187
Inflammation, an important contributory factor of muscle and bone aging, is potentially modulated by diet. This study examined the associations of dietary inflammatory index (DII) score with musculoskeletal parameters and related disease outcomes in 3995 community-dwelling Chinese men and women aged ≥65 years in Hong Kong. DII score at baseline was estimated from a food frequency questionnaire. Bone mineral density (BMD) and muscle mass estimated by dual-energy X-ray absorptiometry (DXA), hand grip strength, gait speed, and chair stand test were measured at baseline, year 4, and year 14. The associations of DII score with the longitudinal changes of musculoskeletal parameters, and incidence of osteoporosis, sarcopenia, and fractures were examined by using general linear model, multinomial logistic regression model, and Cox proportional hazards regression model, respectively. After multiple adjustments, each tertile increase in DII score in men was associated with 0.37 (95% confidence interval [CI], 0.10–0.64) kg loss in grip strength and 0.02 (95% CI, 0.01–0.03) m/s loss in gait speed over 4 years. In men, the highest tertile of DII was associated with a higher risk of incident fractures, with adjusted and competing death adjusted hazard ratio (HR) (95% CI) of 1.56 (1.14–2.14) and 1.40 (1.02–1.91), respectively. In women, DII score was not significantly associated with any muscle-related outcomes or incidence of fracture, but a significant association between higher DII score and risk of osteoporosis at year 14 was observed, with the highest tertile of DII score having adjusted odds ratio (OR) (95% CI) of 1.90 (1.03–3.52). In conclusion, pro-inflammatory diet consumption promoted loss of muscle strength and physical function, and increased risk of fractures in older Chinese men. Pro-inflammatory diets had no significant association with muscle related outcomes but increased the long-term risk of osteoporosis in older Chinese women. © 2022 American Society for Bone and Mineral Research (ASBMR). 相似文献